Happened on both walls
This happened on both walls on our 2014 Thor Challenger 37GT. Once it starts they start pulling further and further back as you drive. Ours was wide enough to see the carpet through the floor. Also the carpet would get wet as we drove down the road when it rained.
Called Thor several times and finally they paid some of the bill, I think eight hours of repair work. The work consisted of attaching the side walls, repairing the cracks in the fiber glass, and painting. You will have to take it to an authorized repair location.
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